CVE-2026-72465 xprtrdma: Sanitize the reply credit grant after parsing
A remote attacker can cause a denial of service in the Linux kernel by sending crafted RDMA replies with inflated credit grants, exhausting resources.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72465?
CVE-2026-72465 is a high-severity denial of service vulnerability in Linux, published on 15 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
xprtrdma: Sanitize the reply credit grant after parsing
The out_norqst exit in rpcrdma_reply_handler() branches away before the credit clamp, so a reply that matches no pending request reaches out_post carrying the raw credit value parsed from the wire. rpcrdma_post_recvs() does not bound its @needed argument: the refill loop allocates and chains Receive WRs until the count is satisfied or allocation fails. A peer that sends a well-formed reply carrying an unknown XID and an inflated credit grant therefore drives rep allocation and Receive posting past re_max_requests on every such reply.
Move the clamp to immediately after the credit field is parsed, ahead of the first branch that can reach out_post, so every later consumer sees a sanitized value. The cwnd update stays on the matched-request path.
Which versions are affected by CVE-2026-72465?
How do I fix CVE-2026-72465?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-72465 being exploited?
There is no known exploitation of CVE-2026-72465 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-72465, GHSA-qhx3-pwwp-v2cp, UBUNTU-CVE-2026-72465.